Method of preserving wood.



UNITE s 'rns PATENT orn on.

GEORG- HARTMANN AND OSKAR LALWI N SC HWERDTNER, OF GROSS SCI IGNAU, NEARZITT'AU, GERMANY.

METHOD OF PRESERVING WOOD.

No Drawing.

To all whom it may concern:

Be it known that we, Gnone HARTMANN,

- a subject of the King of Saxony, residing at Gross Schtinau, nearZittau, in Saxony, Empire of Germany, and OSKAR ALWIN SOHWERDTNER, asubject of the King of Saxony, residing at Gross Schonan, near Zittau,in Saxony, Empire of Germany, have invented a certaln new and useful Imroved;

Method of Preserving Wood, of which the following is a specification.

This invention relates to a method of protecting Wood against dry-rotand other Wood destroying agents characterized by treating the objectsattached by such agents or threatened with infection with a solution ofsodium-zincate. Such solution is prepared by mixing a solution ofchlorid of zinc with caustic soda (sodium hydrate) in excess. Forinstance we dissolve 300 parts by-weight of chloridzofzinc'in 1000 partsof water and add to this a solution of 900 parts of caustic soda in 4000parts of water. By applying two coats of this compound to wood, the.

same will be protected throughout against the destroying action ofdry-rot or other organic Wood-destroying agencies, and, if the wood bealready attacked, the destroying organism is completely extirpated. 7 Bythe combination with sodium zincate Specification of Letters Patent.Application filed January 17, 1910. Serial No. 538,548.

Patented Nov. 8, 1910.

of sodium hydrate in excess, the alkali forms with the chlorin of thezinc chlorid, sodium chlor1dor ordinary salt. The presence of the sodiumchlorid increases the diffusibility of the sodium zincate and thusrenders possible a much better impregnation of the wood.

This method, compared with other methods for the same purpose, has thead vantage that it may be carried out at ordinary temperature and thatthe woodwork or other object treated is in, no way rendered unsightly orinjuriously affected in'any respect. v I

What we claim as our invention and desire to secure by Letters Patentis:

1. The method of preserving wood, which consists in applying thereto asolution of sodium zincate and sodium chlorid.

2. The method of preserving wood which consists in applying thereto 'atthe ordinary temperature a solution. of sodiumzincato and sodiumchlorid.

In testimony whereof we have signed our names to this specification inthe present-e

